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Last Post 17 May 2012 09:35 AM by  glennj@logicpd.com
Article: iMX31 -- Why No DDR Memory Series Resistors?
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glennj@logicpd.com
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17 May 2012 09:35 AM
    Q: Why are there no series resistors on all of the signals to the DDR memory on the iMX31 LITEKIT?

    A:
    The i.MX31 LITEKIT excludes the series resistors on the DDR interface for these reasons:
    • Freescale testing on the IMX31 ADS kit found that series resistors provided little to no signal integrity improvement on DDR lines.
    • Low power (mobile) DDR has drive strength control on chip.
    • i.MX31 CPU has some drive strength control on DDR lines.
    • All EMC compliance testing passed without series resistors.

    PRODUCTS Included:
    iMX31
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